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          <h1 class="post-title" itemprop="name headline">awk常用的几种命令</h1>
        

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        <p><code>awk &#39;{if($4==&quot;check#10007_100&quot; &amp;&amp; $9==&quot;47002&quot;) print $0}&#39; action_log_2019-03-15.log &gt; 10007.log</code></p>
<p>1.分隔符<br><code>awk -F, &#39;{print $1}&#39; tt</code><br><code>awk &#39;BEGIN{FS=&quot;,&quot;} /2/ {print $1}&#39; tt</code></p>
<p>2.正则匹配<br> <code>awk &#39;BEGIN{FS=&quot;,&quot;} $2 ~ /2/ {print $2}&#39; tt</code><br> <code>awk &#39;BEGIN{FS=&quot;,&quot;} $2 !~ /2/ {print $2}&#39; tt</code></p>
<p>3.去重<br><code>awk &#39;NF &gt; 1 &amp;&amp; $(NF-1) !~ /}/ &amp;&amp; !a[$(NF-1)]++   {print $(NF-1)}&#39; action_log_2018-12-03.log &gt; 12-03.log</code></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br></pre></td><td class="code"><pre><span class="line">正则表达式</span><br><span class="line">AWK 可以方便高效地处理正则表达式。大量复杂的任务都可以由极其简单的正则表达式来解决。每一个精通命令行的人都知道正则表达式真正的威力所在。</span><br><span class="line"></span><br><span class="line">这一章将着重讲解标准正则表达式的使用方法。</span><br><span class="line"></span><br><span class="line">点（Dot）</span><br><span class="line">点字符（.）可以匹配除了行结束字符的所有字符。比如下面的便子就可以匹配 fin, fun, fan 等等。</span><br><span class="line"></span><br><span class="line">[jerry]$ echo -e &quot;cat\nbat\nfun\nfin\nfan&quot; | awk &apos;/f.n/&apos;</span><br><span class="line">执行上面命令可以得到如下结果：</span><br><span class="line"></span><br><span class="line">fun</span><br><span class="line">fin</span><br><span class="line">fan</span><br><span class="line">行开始</span><br><span class="line">行开始符(^)匹配一行的开始。下面的示例将输出所有以字符串 The 开始的行。</span><br><span class="line"></span><br><span class="line">[jerry]$ echo -e &quot;This\nThat\nThere\nTheir\nthese&quot; | awk &apos;/^The/&apos;</span><br><span class="line">执行上面的命令可以得到如下结果：</span><br><span class="line"></span><br><span class="line">There</span><br><span class="line">Their</span><br><span class="line">行结束</span><br><span class="line">行结束符($)匹配一行的结束。下面的例子中将输出所有以字符 n 结束的行：</span><br><span class="line"></span><br><span class="line">[jerry]$ echo -e &quot;knif\nknow\nfun\nfin\nfan\nnine&quot; | awk &apos;/n$/&apos;</span><br><span class="line">执行上面的命令可以得到如下结果：</span><br><span class="line"></span><br><span class="line">fun</span><br><span class="line">fin</span><br><span class="line">fan</span><br><span class="line">匹配字符集</span><br><span class="line">匹配字符集用于匹配集合（由方括号表示）中的一个字符。如下例子中，匹配 Call 与 Tall 而不会匹配 Ball。</span><br><span class="line"></span><br><span class="line">[jerry]$ echo -e &quot;Call\nTall\nBall&quot; | awk &apos;/[CT]all/&apos;</span><br><span class="line">执行上面的命令可以得到如下结果：</span><br><span class="line"></span><br><span class="line">fun</span><br><span class="line">fin</span><br><span class="line">fan</span><br><span class="line">排除集</span><br><span class="line">正则匹配时会排除集合中的字符。如下例子中只会输出 Ball。</span><br><span class="line"></span><br><span class="line">[jerry]$ echo -e &quot;Call\nTall\nBall&quot; | awk &apos;/[^CT]all/&apos;</span><br><span class="line">执行上面的命令可以得到如下结果：</span><br><span class="line"></span><br><span class="line">Ball</span><br><span class="line">或</span><br><span class="line">竖线(|)允许正则表达式实现逻辑或运算. 下面例子将会输出 Ball 与 Call 。</span><br><span class="line"></span><br><span class="line">[jerry]$ echo -e &quot;Call\nTall\nBall\nSmall\nShall&quot; | awk &apos;/Call|Ball/&apos;</span><br><span class="line">执行上面的命令可以得到如下结果：</span><br><span class="line"></span><br><span class="line">Call</span><br><span class="line">Ball</span><br><span class="line">最多出现一次</span><br><span class="line">该符号( ？)前面的字符不出现或者出现一次。如下示例匹配 Colour 与 Color。 使用 ? 使得 u 变成了可选字符 。</span><br><span class="line"></span><br><span class="line">[jerry]$ echo -e &quot;Colour\nColor&quot; | awk &apos;/Colou?r/&apos;</span><br><span class="line">执行上面的命令可以得到如下结果：</span><br><span class="line"></span><br><span class="line">Colour</span><br><span class="line">Color</span><br><span class="line">出现零次或多次</span><br><span class="line">该符号(＊) 允许其前的字符出现多次或者不出现。如下示例将匹配 ca，cat, catt 等等。</span><br><span class="line"></span><br><span class="line">[jerry]$ echo -e &quot;ca\ncat\ncatt&quot; | awk &apos;/cat*/&apos;</span><br><span class="line">执行上面的命令可以得到如下结果：</span><br><span class="line"></span><br><span class="line">ca</span><br><span class="line">cat</span><br><span class="line">catt</span><br><span class="line">出现一次或多次</span><br><span class="line">该符号(+)使得其前的字符出现一次或者多次。下面的例子会匹配一个 2 或者多个连续的 2。</span><br><span class="line"></span><br><span class="line">[jerry]$ echo -e &quot;111\n22\n123\n234\n456\n222&quot;  | awk &apos;/2+/&apos;</span><br><span class="line">执行上面的命令可以得到如下结果：</span><br><span class="line"></span><br><span class="line">22</span><br><span class="line">123</span><br><span class="line">234</span><br><span class="line">222</span><br><span class="line">分组</span><br><span class="line">括号用于分组而字符 | 用于提供多种选择。如下的正则表达式会匹配所有包含 Apple Juice 或 Aplle Cake 的行。</span><br><span class="line"></span><br><span class="line">[jerry]$ echo -e &quot;Apple Juice\nApple Pie\nApple Tart\nApple Cake&quot; | awk &apos;/Apple (Juice|Cake)/&apos;</span><br><span class="line">执行上面的命令可以得到如下结果：</span><br><span class="line"></span><br><span class="line">Apple Juice</span><br><span class="line">Apple Cake</span><br></pre></td></tr></table></figure>

      
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